Steering Chassis Buffer battery (G3) and redundant power supply (RPS) control unit (A76) If the on-board electrical system fails and the engine stops at the same time while driving, the buffer battery (G3) supplies the electric steering assist. The buffer battery is located on the left longitudinal frame member in the vicinity of the 1st rear axle. It consists of two 12 V blocks. The buffer battery is connected to the on-board electrical system via the redundant power supply (RPS) control unit (A76). In steel-sprung vehicles, the control unit is installed on the crossmember in front of the 1st rear axle.
W54.10-1165-00 G3 Buffer battery A76 Redundant power supply (RPS) control unit The buffer battery supplies only the electric steer- ing assist with a voltage of 24 V when the normal power supply has failed. The buffer battery can only be replaced at the work- shop. Warning indicators A red warning indicator in the speedometer and a virtual indication in the display alert the driver to a failure or malfunction of the steering system. The virtual indication in the display is a redundancy feature in the event of failure of the real warning indicator, and ensures that the fault message remains visible when the pop-up has been acknowl- edged.
With the warning indicators there appears a display pop-up with a symbol and text messages: W54.32-1035-00 Warning indicators in instrument cluster 1st page: Steering wheel symbol and brief text message (restricted function) 2nd page: With long text (driver instructions) when the right arrow steering wheel button is pressed 63 i Introduction of the New Truck Generation - The New Arocs (Model 964) – This printout will not be recorded by the update service. Status: 01 / 2013 –